Home / 28,356.20-39,130.74-15,780.68

Finding the Fourth Proportional to 28,356.20, 39,130.74 and 15,780.68

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Solution

The fourth proportional to 28,356.20, 39,130.74 and 15,780.68 is: 21,776.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356.20 : 39,130.74 = 15,780.68 : x
  2. Step 2: Convert to fraction form
    28,356.20/39,130.74 = 15,780.68/x
  3. Step 3: Cross multiply
    28,356.20x = 39,130.74 × 15,780.68
  4. Step 4: Simplify right side
    28,356.20x = 617,509,686.10
  5. Step 5: Solve for x
    x = 617,509,686.10/28,356.20
  6. Step 6: Final answer
    x = 21,776.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.